Recommended Maintenance Schedule; Troubleshooting; Replacing Defective Modules; Complete Unit Stoppage And Restart - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

Periodic cleaning of the required field-installed
Strainer —
strainer is required. Pressure drop across strainer in excess of
3 psi (21 kPa) indicates the need for cleaning. Normal (clean)
pressure drop is approximately 1 psi (6.9 kPa). Open the
blowdown valve to clean the strainer. If required, shut the
chiller down and remove the strainer screen to clean. When
strainer has been cleaned, enter 'YES' for Strainer Mainte-

nance Done (Run Status PM
Replacing Defective Modules —
Link replacement modules are shown in Table 50. If the main
base board (MBB) has been replaced, verify that all configura-
tion data is correct. Follow the Configuration mode table and
verify that all items under sub-modes UNIT, OPT1 and OPT2
are correct. Any additional field-installed accessories or op-
tions (RSET, SLCT sub-modes) should also be verified as well
as any specific time and maintenance schedules.
Refer to the Start-Up Checklist for 30MP Liquid Chillers
(completed at time of original start-up) found in the job folder.
This information is needed later in this procedure. If the check-
list does not exist, fill out the current information in the Config-
uration mode on a new checklist. Tailor the various options and
configurations as needed for this particular installation.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all discon-
nect locations to alert others not to restore power until work
is completed.
1. Check that all power to unit is off. Carefully disconnect
all wires from the defective module by unplugging its
connectors.
2. Remove the defective module by removing its mounting
screws with a Phillips screwdriver, and removing the
module from the control box. Save the screws later use.
3. Verify that the instance jumper (MBB) or address switch-
es (all other modules) exactly match the settings of the
defective module.
NOTE: Handle boards by mounting standoffs only to
avoid electrostatic discharge.
4. Package the defective module in the carton of the new
module for return to Carrier.
5. Mount the new module in the unit's control box using a
Phillips screwdriver and the screws saved in Step 2.
6. Reinstall all module connectors. For accessory Naviga-
tor™ device replacement, make sure the plug is installed
at TB3 in the LEN connector.
7. Carefully check all wiring connections before restoring
power.
8. Verify the ENABLE/OFF/REMOTE CONTROL switch
is in the OFF position.
9. Restore control power. Verify that all module red LEDs
blink in unison. Verify that all green LEDs are blinking
and that the scrolling marquee or Navigator™ display is
communicating correctly.
10. Verify all configuration information, settings, set points
and schedules. Return the ENABLE/OFF/REMOTE
CONTROL switch to its previous position.

S.T.MN).
The Comfort-
Table 50 — Replacement Modules
MODULE
Main Base Board (MBB)
Scrolling Marquee Display
Energy Management Module (EMM)
Navigator Display
Electronic Expansion Valve (EXV)
MAINTENANCE
Recommended Maintenance Schedule —
following are only recommended guidelines. Jobsite condi-
tions may dictate that maintenance tasks are performed
more often than recommended.
Routine
:
Every month:
• Check water quality. Inspection interval to be determined
by site conditions and water quality specialist.
• Check moisture indicating sight glass for possible refrig-
erant loss and presence of moisture.
Every 3 months (for all machines):
• Check refrigerant charge.
• Check all refrigerant joints and valves for refrigerant
leaks, repair as necessary.
• Check chilled water flow switch operation.
• Check compressor oil level.
Every 6 months (for all machines):
• Clean chilled water/condenser water flow switch sensor
tip.
Every 12 months (for all machines):
• Check all electrical connections, tighten as necessary.
• Inspect all contactors and relays, replace as necessary.
• Check accuracy of thermistors, replace if greater than
± 2° F (1.2° C) variance from calibrated thermometer.
• Check to be sure that the proper concentration of anti-
freeze is present in the chilled water loop, if applicable.
• Verify that the chilled water loop is properly treated.
• Check refrigerant filter driers for excessive pressure
drop, replace as necessary. The 30MP015-045 units con-
tain a hermetic filter drier. The 30MP050-071 units con-
tain a replaceable core type filter drier.
• Check chilled water and condenser strainers, clean as
necessary.
• Perform Service Test to confirm operation of all
components.
• Check for excessive cooler approach (Leaving Chilled
Water Temperature – Saturated Suction Temperature)
which may indicate fouling. Clean evaporator if necessary.
• Check for excessive condenser approach (Saturated Dis-
charge Pressure – Leaving Condenser Water Temperature)
which may indicate fouling. Clean condenser if necessary
(30MPW only).

TROUBLESHOOTING

Complete Unit Stoppage and Restart —
ble causes for unit stoppage and reset methods are shown be-
low and in Table 51. Refer to Fig. 2-6 for component arrange-
ment and control wiring diagrams.
GENERAL POWER FAILURE — After power is restored,
restart is automatic through normal MBB start-up.
UNIT ENABLE-OFF-REMOTE CONTROL SWITCH IS
OFF — When the switch is OFF, the unit will stop immediate-
ly. Place the switch in the ENABLE position for local switch
control or in the REMOTE CONTROL position for control
through remote control closure.
52
REPLACEMENT
PART NO.
(with Software)
30MP500346
HK50AA031
30GT515218
HK50AA033
30GT515217
The
Possi-